From Andrew, of the Andrew's OS Blog:

Today I am (finally) releasing the Virtual OS Museum, which is the world's first multi-platform interactive virtual museum of operating systems and standalone applications, implemented as a Linux VM.

Nearly all well-known OSes and platforms (and many obscure ones) are included in some form, spanning the entire history of stored-program computing from the 1948 Manchester Baby to the present day. This is the result of over 20 years of collecting emulators and VM images; over 1700 VM installations are included, across over 250 platforms, representing nearly 600 distinct OSes.

I have put a lot of effort into making this readily accessible; all OSes and emulators are pre-installed, and a cross-emulator graphical launcher with a snapshot feature to revert VM installations to a working state is included. Shortcuts to run the OS museum VM on Windows, macOS, and Linux are included (and it is possible to run it on pretty much anything that runs QEMU or VirtualBox).